Having tons of my stuff out on the web (or magazines) doesn't do a whole lot for me. You're on my facebook friends list; take a quick gander and you'll see that I really don't post many photos.

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Saw some really nice results with Sigma's 150-600mm - even with a 1.4 or so attached. Seemed even better than Canon (ugh). As I understand it, that lens even comes with calibration software - and it shines when tuned.

I've never shot with the Sigma, But my Tamron generally walks over the Canon 100-400. Very capable lens. I'll be heading to NWO Sunday to do some more sunrise - sunset monster zooms. I rarely remove it when in the Midwest.